summaryrefslogtreecommitdiffstatshomepage
path: root/src/devices/cpu/pic1670
diff options
context:
space:
mode:
author Olivier Galibert <galibert@pobox.com>2020-06-11 23:13:53 +0200
committer Olivier Galibert <galibert@pobox.com>2020-06-11 23:14:04 +0200
commit1edc4eb3599bcb0464376875e0d38a6582a134fe (patch)
tree2afa614a7d1a1572265b837fa3ef65653104481d /src/devices/cpu/pic1670
parent757c179183c6b4f80375c58900716a1df2b5ac34 (diff)
pic1670: Add a disassembler [O. Galibert]
Diffstat (limited to 'src/devices/cpu/pic1670')
-rw-r--r--src/devices/cpu/pic1670/pic1670d.cpp103
-rw-r--r--src/devices/cpu/pic1670/pic1670d.h34
2 files changed, 137 insertions, 0 deletions
diff --git a/src/devices/cpu/pic1670/pic1670d.cpp b/src/devices/cpu/pic1670/pic1670d.cpp
new file mode 100644
index 00000000000..a9fc677ad06
--- /dev/null
+++ b/src/devices/cpu/pic1670/pic1670d.cpp
@@ -0,0 +1,103 @@
+// license:BSD-3-Clause
+// copyright-holders:Olivier Galibert
+
+// PIC1670 disassembler
+
+#include "emu.h"
+#include "pic1670d.h"
+
+u32 pic1670_disassembler::opcode_alignment() const
+{
+ return 1;
+}
+
+char pic1670_disassembler::fw(u16 opcode)
+{
+ return opcode & 0x40 ? 'f' : 'w';
+}
+
+std::string pic1670_disassembler::freg(u16 opcode) const
+{
+ static const char *const fnames[0x10] = {
+ "(fsr)", "w", "pc", "asr", "fsr", "isr", "rtcca", "rtccb",
+ "riopa", "iopa", "riopb" "iopb", "riorpc", "iopc", "riopd", "iopd"
+ };
+ u16 reg = opcode & 0x3f;
+ if(reg < 0x10)
+ return fnames[reg];
+ return util::string_format("f_%02x", reg);
+}
+
+std::string pic1670_disassembler::imm8(u16 opcode)
+{
+ if((opcode & 0xff) < 10)
+ return util::string_format("%d", opcode & 0xff);
+ else
+ return util::string_format("'h'%02x", opcode & 0xff);
+}
+
+// Note: the decodes have more don't care than the manual, they reflect the
+// reality of the opcode decode of the die, e.g. bits 3,4,5 are not used there
+
+#define P std::ostream &stream, const pic1670_disassembler *d, u16 opcode, u16 pc
+const pic1670_disassembler::instruction pic1670_disassembler::instructions[] {
+ { 0x0004, 0x1fc7, [](P) -> u32 { util::stream_format(stream, "daw" ); return 1; } },
+ { 0x0040, 0x1fc0, [](P) -> u32 { util::stream_format(stream, "movwf %s", d->freg(opcode) ); return 1; } },
+ { 0x0080, 0x1f80, [](P) -> u32 { util::stream_format(stream, "subbwf %s, %c", d->freg(opcode), fw(opcode)); return 1; } },
+ { 0x0100, 0x1f80, [](P) -> u32 { util::stream_format(stream, "subwf %s, %c", d->freg(opcode), fw(opcode)); return 1; } },
+ { 0x0180, 0x1f80, [](P) -> u32 { util::stream_format(stream, "decf %s, %c", d->freg(opcode), fw(opcode)); return 1; } },
+ { 0x0200, 0x1f80, [](P) -> u32 { util::stream_format(stream, "iorwf %s, %c", d->freg(opcode), fw(opcode)); return 1; } },
+ { 0x0280, 0x1f80, [](P) -> u32 { util::stream_format(stream, "andwf %s, %c", d->freg(opcode), fw(opcode)); return 1; } },
+ { 0x0300, 0x1f80, [](P) -> u32 { util::stream_format(stream, "xorwf %s, %c", d->freg(opcode), fw(opcode)); return 1; } },
+ { 0x0380, 0x1f80, [](P) -> u32 { util::stream_format(stream, "addwf %s, %c", d->freg(opcode), fw(opcode)); return 1; } },
+ { 0x0400, 0x1f80, [](P) -> u32 { util::stream_format(stream, "adcwf %s, %c", d->freg(opcode), fw(opcode)); return 1; } },
+ { 0x0480, 0x1f80, [](P) -> u32 { util::stream_format(stream, "comf %s, %c", d->freg(opcode), fw(opcode)); return 1; } },
+ { 0x0500, 0x1f80, [](P) -> u32 { util::stream_format(stream, "incf %s, %c", d->freg(opcode), fw(opcode)); return 1; } },
+ { 0x0580, 0x1f80, [](P) -> u32 { util::stream_format(stream, "decfsz %s, %c", d->freg(opcode), fw(opcode)); return 1; } },
+ { 0x0600, 0x1f80, [](P) -> u32 { util::stream_format(stream, "rlcf %s, %c", d->freg(opcode), fw(opcode)); return 1; } },
+ { 0x0680, 0x1f80, [](P) -> u32 { util::stream_format(stream, "rrcf %s, %c", d->freg(opcode), fw(opcode)); return 1; } },
+ { 0x0700, 0x1f80, [](P) -> u32 { util::stream_format(stream, "swapf %s, %c", d->freg(opcode), fw(opcode)); return 1; } },
+ { 0x0780, 0x1f80, [](P) -> u32 { util::stream_format(stream, "incfsz %s, %c", d->freg(opcode), fw(opcode)); return 1; } },
+
+ { 0x1000, 0x1fc0, [](P) -> u32 { util::stream_format(stream, "movfw %s", d->freg(opcode) ); return 1; } },
+ { 0x1040, 0x1fc0, [](P) -> u32 { util::stream_format(stream, "clrf %s", d->freg(opcode) ); return 1; } },
+ { 0x1080, 0x1fc0, [](P) -> u32 { util::stream_format(stream, "rrncf %s", d->freg(opcode) ); return 1; } },
+ { 0x10c0, 0x1fc0, [](P) -> u32 { util::stream_format(stream, "rlncf %s", d->freg(opcode) ); return 1; } },
+ { 0x1100, 0x1fc0, [](P) -> u32 { util::stream_format(stream, "cpfslt %s", d->freg(opcode) ); return 1; } },
+ { 0x1140, 0x1fc0, [](P) -> u32 { util::stream_format(stream, "cpfseq %s", d->freg(opcode) ); return 1; } },
+ { 0x1180, 0x1fc0, [](P) -> u32 { util::stream_format(stream, "cpfsgt %s", d->freg(opcode) ); return 1; } },
+ { 0x11c0, 0x1fc0, [](P) -> u32 { util::stream_format(stream, "testf %s", d->freg(opcode) ); return 1; } },
+
+ { 0x0800, 0x1e00, [](P) -> u32 { util::stream_format(stream, "bcf %d, %s", (opcode >> 6) & 7, d->freg(opcode)); return 1; } },
+ { 0x0a00, 0x1e00, [](P) -> u32 { util::stream_format(stream, "bsf %d, %s", (opcode >> 6) & 7, d->freg(opcode)); return 1; } },
+ { 0x0c00, 0x1e00, [](P) -> u32 { util::stream_format(stream, "btfsc %d, %s", (opcode >> 6) & 7, d->freg(opcode)); return 1; } },
+ { 0x0e00, 0x1e00, [](P) -> u32 { util::stream_format(stream, "btfss %d, %s", (opcode >> 6) & 7, d->freg(opcode)); return 1; } },
+
+ { 0x0000, 0x1fc7, [](P) -> u32 { util::stream_format(stream, "nop" ); return 1; } },
+ { 0x0001, 0x1fc7, [](P) -> u32 { util::stream_format(stream, "halt" ); return 1; } },
+ { 0x0002, 0x1fc7, [](P) -> u32 { util::stream_format(stream, "retfi" ); return 1 | STEP_OUT; } },
+ { 0x0003, 0x1fc7, [](P) -> u32 { util::stream_format(stream, "retfs" ); return 1 | STEP_OUT; } },
+ { 0x1200, 0x1f00, [](P) -> u32 { util::stream_format(stream, "movlw %s", imm8(opcode)); return 1; } },
+ { 0x1300, 0x1f00, [](P) -> u32 { util::stream_format(stream, "addlw %s", imm8(opcode)); return 1; } },
+ { 0x1400, 0x1f00, [](P) -> u32 { util::stream_format(stream, "iorlw %s", imm8(opcode)); return 1; } },
+ { 0x1500, 0x1f00, [](P) -> u32 { util::stream_format(stream, "andlw %s", imm8(opcode)); return 1; } },
+ { 0x1600, 0x1f00, [](P) -> u32 { util::stream_format(stream, "xorlw %s", imm8(opcode)); return 1; } },
+ { 0x1700, 0x1f00, [](P) -> u32 { util::stream_format(stream, "retlw %s", imm8(opcode)); return 1 | STEP_OUT; } },
+
+ { 0x1800, 0x1c00, [](P) -> u32 { util::stream_format(stream, "goto %03x", opcode & 0x3ff); return 1; } },
+ { 0x1c00, 0x1c00, [](P) -> u32 { util::stream_format(stream, "call %03x", opcode & 0x3ff); return 1 | STEP_OVER; } },
+
+ { 0x0000, 0x0000, [](P) -> u32 { util::stream_format(stream, "?%04x", opcode); return 1; } },
+};
+
+#undef P
+
+offs_t pic1670_disassembler::disassemble(std::ostream &stream, offs_t pc, const data_buffer &opcodes, const data_buffer &params)
+{
+ u16 opcode = opcodes.r16(pc);
+
+ for(u32 i=0;; i++)
+ if((opcode & instructions[i].mask) == instructions[i].value)
+ return instructions[i].cb(stream, this, opcode, pc) | SUPPORTED;
+ return 0;
+}
diff --git a/src/devices/cpu/pic1670/pic1670d.h b/src/devices/cpu/pic1670/pic1670d.h
new file mode 100644
index 00000000000..cf96f43b632
--- /dev/null
+++ b/src/devices/cpu/pic1670/pic1670d.h
@@ -0,0 +1,34 @@
+// license:BSD-3-Clause
+// copyright-holders:Olivier Galibert
+
+// PIC1670 disassembler
+
+#ifndef MAME_CPU_PIC1670_PIC1670D_H
+#define MAME_CPU_PIC1670_PIC1670D_H
+
+#pragma once
+
+class pic1670_disassembler : public util::disasm_interface
+{
+public:
+ pic1670_disassembler() = default;
+ virtual ~pic1670_disassembler() = default;
+
+ virtual u32 opcode_alignment() const override;
+ virtual offs_t disassemble(std::ostream &stream, offs_t pc, const data_buffer &opcodes, const data_buffer &params) override;
+
+private:
+ struct instruction {
+ u16 value;
+ u16 mask;
+ u32 (*cb)(std::ostream &, const pic1670_disassembler *, u16, u16);
+ };
+
+ static const instruction instructions[];
+
+ std::string freg(u16 opcode) const;
+ static char fw(u16 opcode);
+ static std::string imm8(u16 opcode);
+};
+
+#endif // MAME_CPU_PIC1670_PIC1670D_H